https://javaee.github.io/servlet-spec/: Java.net - The Source for Java Technology Collaboration (GlassFish Community) 
public interface javax.servlet.AsyncListener extends java.util.EventListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.servlet.AsyncListener
  super_class: java.lang.Object
{
  public abstract void onComplete(javax.servlet.AsyncEvent);
    descriptor: (Ljavax/servlet/AsyncEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      event  

  public abstract void onTimeout(javax.servlet.AsyncEvent);
    descriptor: (Ljavax/servlet/AsyncEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      event  

  public abstract void onError(javax.servlet.AsyncEvent);
    descriptor: (Ljavax/servlet/AsyncEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      event  

  public abstract void onStartAsync(javax.servlet.AsyncEvent);
    descriptor: (Ljavax/servlet/AsyncEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      event  
}
SourceFile: "AsyncListener.java"